I want to make sure I stay away from whichever church he belongs to<quoted text>
So you're now saying that there ARE other reasons that people marry besides children.
And if other reasons exist, then people--including same-gender couples--should be allowed to marry based on those reasons.
You can't say that marriage equals mating/procreation and say that other reasons exist at the same time.
"Do you take this woman to be your child bearing appliance"